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I can't tell you what generator to buy but I can tell you that it sounds like you need to buy an engine drive welder and get a suitcase wire feeder for it. Just throwing an opinion at you. Not to tell you your business.

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why do you say that? you might be right! im trying to find a welder that has mig and mig on aluminum with spool gun with 4043 wire. so i can work on sheet metal, trailers, and mild steel pipe (schedule 80) that is 5/16 thick. i also have some aluminum projects as well.
i have a stick welder that runs off the generator, so i was thinking if i could find a welder that did all that and worked well with my generator that would save me some money.

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This is just my $.2 as well
The 252 is really not meant to be a portable machine. 250+/- lbs is a good bit of weight. At 250a on 230v she pulls about 45 amp. Just off the top of my head I think the 7500 generac won't be able to sustain that, thinking it's around a 30-35 amp max. Now at home or in your shop that's a different story.
If "I" had the generator you do and wanted portable mig and spool gun I would go sell my stick machine and use the money towards a Multimatic 200. You get SMAW,GMAW,FCAW AND GTAW in one lil pocket rocket package. The Millermatic 211 is portable as well but a lil heavier and only GMAW and FCAW.
You have a lot of questions to ask yourself before you buy. Do a search, we discussed this at great length a few months ago. Good luck Brett

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I'm gonna go with Precision and say sell the stick machine and get the Multimatic 200, a spool gun, and a TIG torch and be all set(you can wait on the TIG torch till later on). Or else keep the stick machine and get the Miller Matic 211 and spool gun, your choice, to go with the genset you have.
Be sure to post up what your final decision is after you have made up your mind, and got your equipment. Lot's of guys come on here wanting opinions and get many, but then fail to check back in to let us know what they decided on and how it worked out.

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i want portability, i was looking at the multimatic 200 but i feel like i would be sacrificing performance just so i can have mig, tig, and stick in a small unit. instead i think a tig machine would work better for my situation. so I'm looking at the Diversion 180 but i don't know how to calculate the amps and watts. so i dont know if my generator will power it. ill let you all know what i end up doing. thanks for the advice.

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i want portability, i was looking at the multimatic 200 but i feel like i would be sacrificing performance just so i can have mig, tig, and stick in a small unit. instead i think a tig machine would work better for my situation. so I'm looking at the Diversion 180 but i don't know how to calculate the amps and watts. so i dont know if my generator will power it. ill let you all know what i end up doing. thanks for the advice.

You want portability? You may need to go with Fencemakers suggestion and get an engine drive, like a Bob Cat. The Bob Cat 225 has 10,000 watts running power, and 12,000 for the 250. More than your present genset has. You could sell the Generac and stick machine(what is it anyway? you haven't mentioned) to off set the cost of the engine drive. Or keep the stick machine for shop work. Just throwing out a few options for you to consider, depending on what's most important to you. I believe the Bob Cat 250 will power the Diversion 252 you were wanting. You can run a spool gun for aluminum right off the Bob Cat with a conversion box, or load it(spool gun) for MIG. The Bob Cat can also do TIG with the right torch. Don't know what your total needs are, so kinda hard to give exact recommendations.

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What is your idea of portable? I'm completely portable and do 90% of my work outside and a millermatic 252 is very impractical but the miller extreme 12vs suitcase wire feeder with flux core is practical. Also you could tig of the bobcat engine drive mentioned earlier. These other guys on here will have to fill you in on the aluminum.

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portability to me is when i can load up my welder and go. i can haul around anything from 0-200pounds, but i dont want a 200+ welder in my truck bed at all times. i do want a big good engine driven welder but i dont have my own garage to put it in. i cant seem to find a tig welder or any welder that will run off my 7500w 30a generator. i dont want to use the electricity (power) at the place im staying at cuz its not my place. i would like the millermatic 212 or 252 or the diversion180 but it just doesn't seem plausible right now. so i will have to wait till i get a place of my own. i dont have money to buy a bobcat AND a diversion180 or multimatic200 my wife would kill me. at tops i will spend $3000-4000 for everything tig and gas.

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Have you thought about putting all the welding equipment in an enclosed trailer? With that set up you would not need to have anything on your truck at all times. Just hook up and go with it when you need to. It keeps it out of the weather, and out of site of thieves.
If you have a means of lifting, you could build a welding skid for your stuff, and put it on the truck when it needs transport, remove it when not needed.
That's two options to enhance your portability, without having to keep everything on your truck all the time.

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Ok i have one more question for ya. so i bought the Miller diversion 180 welder and i went to plug the 20a 250 volt plug into my generator and it wont fit into my generator. My generator does not have a 20A 250volt plug, it has a 50A A.C. 240volt plug which is a little bigger than the welder plug. what should i do? do i need to get an adaptor or a transformer? where do i get one of these?